"What’s Canadian about Ted Cruz?" asks the narrator in one criticizing the Texas senator for his value-added tax-plan, which it compares to schemes "in Canada and European socialist countries." | AP Photo

Pro-Rubio ad: Ted Cruz has a Canadian tax plan

Conservative Solutions PAC, the super PAC supporting Marco Rubio, on Tuesday released three new television advertisements airing in early primary states, hitting Ted Cruz by name in two of the spots, including one that makes a not-so-subtle reference to the political issue of Cruz's eligibility based on his Canadian birth to an American-born mother.

"What’s Canadian about Ted Cruz?" asks the narrator in one criticizing the Texas senator for his value-added tax-plan, which it compares to schemes "in Canada and European socialist countries."

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Donald Trump first raised the issue of Cruz's eligibility for the presidency last month, saying that it could present significant legal challenges to the Republican Party if the Texas senator were to become the nominee.

But Conservative Solutions says it isn't worried about Cruz's birthplace. "We’re not concerned about Cruz’s citizenship; we’re concerned about his Canadian- and European-style socialist tax plan," the super PAC's spokesman, Jeff Sadosky, told POLITICO. Rubio, unlike several other GOP candidates, has flatly said that Cruz is eligible for the White House.

In another ad, titled "CalculaTED," the super PAC alleges that Cruz "calculates his positions of political gain," remarking upon changes in stance "on immigration, Syrian refugees, ethanol, trade, you name it." The same ad makes reference to Cruz's past indication of support for NSA leaker Edward Snowden before renouncing him. "Ted Cruz, consistently calculated," the ad concludes."

Rubio himself has noted his opposition to Cruz's tax proposal and his campaign has brought up similar issues related to supposed policy shifts.

The other ad in the release makes no mention of Cruz or any other Republican opponent, touting Rubio as a "Democrat nightmare," a "national security expert" and "the next generation of conservative leadership, now."